SMBMS
SMBMS是超市订单管理系统的简称
数据库：
项目如何让搭建？
考虑使用不使用Maven？ 依赖，jar
项目搭建准备工作
1.搭建一个mavenweb项目
2.配置Tomcat
3.测试项目是否能够跑起来
4.导入项目中会遇到的jar包
jsp,servlet,mysql驱动，jstl，stand...
XML
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--JSTL表达式的依赖-->
<dependency>
<groupId>javax.servlet.jsp.jstl</groupId>
<artifactId>jstl-api</artifactId>
<version>1.2</version>
</dependency>
<!--standard标签库-->
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
</dependencies>5.创建项目包结构
6.编写实体类
java
package com.jibu.pojo;
import java.util.Date;
public class User {
private Integer id; //id
private String userCode; //用户编码
private String userName; //用户名称
private String userPassword; //用户密码
private Integer gender; //性别
private Date birthday; //出生日期
private String phone; //电话
private String address; //地址
private Integer userRole; //用户角色
private Integer createdBy; //创建者
private Date creationDate; //创建时间
private Integer modifyBy; //更新者
private Date modifyDate; //更新时间
private Integer age;//年龄
private String userRoleName; //用户角色名称
public String getUserRoleName() {
return userRoleName;
}
public void setUserRoleName(String userRoleName) {
this.userRoleName = userRoleName;
}
public Integer getAge() {
/*long time = System.currentTimeMillis()-birthday.getTime();
Integer age = Long.valueOf(time/365/24/60/60/1000).IntegerValue();*/
Date date = new Date();
Integer age = date.getYear()-birthday.getYear();
return age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserCode() {
return userCode;
}
public void setUserCode(String userCode) {
this.userCode = userCode;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPassword() {
return userPassword;
}
public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}
public Integer getGender() {
return gender;
}
public void setGender(Integer gender) {
this.gender = gender;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Integer getUserRole() {
return userRole;
}
public void setUserRole(Integer userRole) {
this.userRole = userRole;
}
public Integer getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Integer createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Integer getModifyBy() {
return modifyBy;
}
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}
java
package com.jibu.pojo;
import java.util.Date;
public class Role {
private Integer id; //id
private String roleCode; //角色编码
private String roleName; //角色名称
private Integer createdBy; //创建者
private Date creationDate; //创建时间
private Integer modifyBy; //更新者
private Date modifyDate;//更新时间
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getRoleCode() {
return roleCode;
}
public void setRoleCode(String roleCode) {
this.roleCode = roleCode;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
public Integer getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Integer createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Integer getModifyBy() {
return modifyBy;
}
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}
java
package com.jibu.pojo;
import java.util.Date;
public class Provider {
private Integer id; //id
private String proCode; //供应商编码
private String proName; //供应商名称
private String proDesc; //供应商描述
private String proContact; //供应商联系人
private String proPhone; //供应商电话
private String proAddress; //供应商地址
private String proFax; //供应商传真
private Integer createdBy; //创建者
private Date creationDate; //创建时间
private Integer modifyBy; //更新者
private Date modifyDate;//更新时间
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getProCode() {
return proCode;
}
public void setProCode(String proCode) {
this.proCode = proCode;
}
public String getProName() {
return proName;
}
public void setProName(String proName) {
this.proName = proName;
}
public String getProDesc() {
return proDesc;
}
public void setProDesc(String proDesc) {
this.proDesc = proDesc;
}
public String getProContact() {
return proContact;
}
public void setProContact(String proContact) {
this.proContact = proContact;
}
public String getProPhone() {
return proPhone;
}
public void setProPhone(String proPhone) {
this.proPhone = proPhone;
}
public String getProAddress() {
return proAddress;
}
public void setProAddress(String proAddress) {
this.proAddress = proAddress;
}
public String getProFax() {
return proFax;
}
public void setProFax(String proFax) {
this.proFax = proFax;
}
public Integer getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Integer createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Integer getModifyBy() {
return modifyBy;
}
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}
java
package com.jibu.pojo;
import java.math.BigDecimal;
import java.util.Date;
public class Bill {
private Integer id; //id
private String billCode; //账单编码
private String productName; //商品名称
private String productDesc; //商品描述
private String productUnit; //商品单位
private BigDecimal productCount; //商品数量
private BigDecimal totalPrice; //总金额
private Integer isPayment; //是否支付
private Integer providerId; //供应商ID
private Integer createdBy; //创建者
private Date creationDate; //创建时间
private Integer modifyBy; //更新者
private Date modifyDate;//更新时间
private String providerName;//供应商名称
public String getProviderName() {
return providerName;
}
public void setProviderName(String providerName) {
this.providerName = providerName;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getBillCode() {
return billCode;
}
public void setBillCode(String billCode) {
this.billCode = billCode;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public String getProductDesc() {
return productDesc;
}
public void setProductDesc(String productDesc) {
this.productDesc = productDesc;
}
public String getProductUnit() {
return productUnit;
}
public void setProductUnit(String productUnit) {
this.productUnit = productUnit;
}
public BigDecimal getProductCount() {
return productCount;
}
public void setProductCount(BigDecimal productCount) {
this.productCount = productCount;
}
public BigDecimal getTotalPrice() {
return totalPrice;
}
public void setTotalPrice(BigDecimal totalPrice) {
this.totalPrice = totalPrice;
}
public Integer getIsPayment() {
return isPayment;
}
public void setIsPayment(Integer isPayment) {
this.isPayment = isPayment;
}
public Integer getProviderId() {
return providerId;
}
public void setProviderId(Integer providerId) {
this.providerId = providerId;
}
public Integer getCreatedBy() {
return createdBy;
}
public void setCreatedBy(Integer createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public Integer getModifyBy() {
return modifyBy;
}
public void setModifyBy(Integer modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}ORM映射：表和类映射
7.编写基础公共类
1.数据库配置文件
db.properties
XML
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/jdbc?useUnicode=true&characterEncoding=utf-8&useSSL=false
username=root
password=1234562.编写数据库的公共类
java
package com.jibu.dao;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
//操作数据库的公共类
public class BaseDao {
private static String driver;
private static String url;
private static String username;
private static String password;
//静态代码块，类加载的时候就初始化了
static {
Properties properties = new Properties();
//通过类加载器读取对应的资源
InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
try {
properties.load(is);
} catch (IOException e) {
e.printStackTrace();
}
driver = properties.getProperty("driver");
url = properties.getProperty("url");
username = properties.getProperty("username");
password = properties.getProperty("password");
}
//获取数据库的连接
public static Connection getConnection(){
Connection connection = null;
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, username, password);
} catch (Exception e) {
e.printStackTrace();
}
return connection;
}
//编写查询公共方法
public static ResultSet execute(Connection connection,String sql,Object[] params,ResultSet resultSet,PreparedStatement preparedStatement) throws SQLException {
//预编译的SQL, 在后面直接执行就可以了
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符从1开始，但是我们的数组是从0开始！
preparedStatement.setObject(i+1,params[i]);
}
resultSet = preparedStatement.executeQuery();
return resultSet;
}
//编写增删改公共方法
public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {
preparedStatement = connection.prepareStatement(sql);
for (int i = 1; i < params.length; i++) {
//setObject,占位符从1开始，但是我们的数组是从0开始！
preparedStatement.setObject(i+1,params[i]);
}
int updateRows = preparedStatement.executeUpdate();
return updateRows;
}
//释放资源
public static boolean closeResource(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet){
boolean flag = true;
if (resultSet != null) {
try {
resultSet.close();
//GC回收
resultSet = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
if (preparedStatement != null) {
try {
preparedStatement.close();
//GC回收
preparedStatement = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
if (connection != null) {
try {
connection.close();
//GC回收
connection = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
return flag;
}
}3.编写字符编码过滤器
java
package com.jibu.filter;
import javax.servlet.*;
import java.io.IOException;
public class CharacterEncodingFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
chain.doFilter(request,response);
}
@Override
public void destroy() {
}
}
XML
<!--字符编码过滤器-->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>com.jibu.filter.CharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>8.导入静态资源
地址：smbms: 狂神说Java Javaweb练习项目 超市订单管理系统 SMBMS smbmsTomcat10.1.5+jdk21+Mariadb
登录功能实现
流程结构
1.编写前端页面
2.设置首页
XML
<!--设置欢迎页面-->
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>3.编写Dao层登录用户登录的接口
java
package com.jibu.dao.user;
import com.jibu.pojo.User;
import java.sql.Connection;
import java.sql.SQLException;
public interface UserDao {
//得到要登陆的用户
public User getLoginUser(Connection connection,String userCode) throws SQLException;
}4. 编写接口的实现类
java
package com.jibu.dao.user;
import com.jibu.dao.BaseDao;
import com.jibu.pojo.User;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDaoImpl implements UserDao{
@Override
public User getLoginUser(Connection connection, String userCode) throws SQLException {
PreparedStatement pstm = null;
ResultSet rs = null;
User user = null;
if (connection != null) {
String sql = "select * from smbms_user where userCode=?";
Object[] params = {userCode};
rs = BaseDao.execute(connection, pstm, rs, sql, params);
if (rs.next()){
user = new User();
user.setId(rs.getInt("id"));
user.setUserCode(rs.getString("userCode"));
user.setUserName(rs.getString("userName"));
user.setUserPassword(rs.getString("userPassword"));
user.setGender(rs.getInt("gender"));
user.setBirthday(rs.getDate("birthday"));
user.setPhone(rs.getString("phone"));
user.setAddress(rs.getString("address"));
user.setUserRole(rs.getInt("userRole"));
user.setCreatedBy(rs.getInt("createdBy"));
user.setCreationDate(rs.getTimestamp("creationDate"));
user.setModifyBy(rs.getInt("modifyBy"));
user.setModifyDate(rs.getTimestamp("modifyDate"));
}
BaseDao.closeResource(null,pstm,rs);
}
return user;
}
}5.业务层接口
java
package com.jibu.service.user;
import com.jibu.pojo.User;
public interface UserService {
//用户登录
public User login(String userCode,String password);
}6.业务层实现类
java
package com.jibu.service.user;
import com.jibu.dao.BaseDao;
import com.jibu.dao.user.UserDao;
import com.jibu.dao.user.UserDaoImpl;
import com.jibu.pojo.User;
import org.junit.Test;
import java.sql.Connection;
import java.sql.SQLException;
public class UserServiceImpl implements UserService{
//业务层都会调用dao层，所以我们要引入Dao层；
private UserDao userDao;
public UserServiceImpl(){
userDao = new UserDaoImpl();
}
@Override
public User login(String userCode, String password) {
Connection connection = null;
User user = null;
try {
connection = BaseDao.getConnection();
//通过业务层调用具体的数据库操作
user = userDao.getLoginUser(connection, userCode);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return user;
}
// @Test
// public void test(){
// UserServiceImpl userService = new UserServiceImpl();
// User admin = userService.login("admin", "1234567");
// System.out.println(admin.getUserPassword());
// }
}7.编写servlet
java
package com.jibu.servlet.user;
import com.jibu.pojo.User;
import com.jibu.service.user.UserService;
import com.jibu.service.user.UserServiceImpl;
import com.jibu.util.Constants;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class LoginServlet extends HttpServlet {
//Servlet:控制层，调用业务层代码
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("LoginServlet--start...");
//获取用户名和密码
String userCode = req.getParameter("userCode");
String userPassword = req.getParameter("userPassword");
//和数据库中的密码进行对比，调用业务层；
UserService userService = new UserServiceImpl();
User user = userService.login(userCode, userPassword); //这里已经把登录的人给查出来了
if (user!=null){//查有此人，可以登录
//将用户的信息放到Session中
req.getSession().setAttribute(Constants.USER_SESSION,user);
//跳转到主页
resp.sendRedirect("jsp/frame.jsp");
}else {//查无此人，无法登录
//转发会登录页面，顺带提示它，用户名或者密码错误；
req.setAttribute("error","用户名或者密码不正确");
req.getRequestDispatcher("login.jsp").forward(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}8.注册Servlet
XML
<!--Servlet-->
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.jibu.servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>9.测试访问，确保以上功能成功！
登录功能优化
注销功能：
思路：一处Session，返回登录页面
java
package com.jibu.servlet.user;
import com.jibu.util.Constants;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class LogoutServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//移除用户的Session：Constants.USER_SESSION
req.getSession().removeAttribute(Constants.USER_SESSION);
resp.sendRedirect("/login.jsp");//返回登录页面
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}注销XML
XML
<servlet>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>com.jibu.servlet.user.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>登录拦截器
编写一个过滤器，并注册
java
package com.jibu.filter;
import com.jibu.pojo.User;
import com.jibu.util.Constants;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class SysFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
//过滤器，从Session中获取用户，
User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
if (user!=null){
// 用户已登录，允许请求继续
chain.doFilter(req,resp);
} else {
// 用户未登录，重定向到登录页面或显示错误信息
response.sendRedirect("/smbms/error.jsp");
}
}
@Override
public void destroy() {
}
}
XML
<!--用户登录过滤器-->
<filter>
<filter-name>SysFilter</filter-name>
<filter-class>com.jibu.filter.SysFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SysFilter</filter-name>
<url-pattern>/jsp/*</url-pattern>
</filter-mapping>测试，登录，注销，权限都要保证OK！
密码修改
1.导入前端素材
html
<li><a href="${pageContext.request.contextPath }/jsp/pwdmodify.jsp">密码修改</a></li>2.写项目，建议从底层向上写
3.UserDao接口
java
//修改当前用户密码
public int updatePwd(Connection connection,int id,int password) throws SQLException;4.UserDao接口实现类
java
//修改当前用户密码
@Override
public int updatePwd(Connection connection, int id, int password) throws SQLException {
PreparedStatement pstm = null;
int execute = 0;
if (connection!=null){
String sql = "update smbms_user set userPassword = ? where id = ?";
Object params[] = {password,id};
execute = BaseDao.execute(connection, pstm, sql, params);
BaseDao.closeResource(null,pstm,null);
}
return execute;
}5.UserService层
java
//根据用户id修改密码
public boolean updatePwd(int id, int pwd);6. UserService实现类
java
@Override
public boolean updatePwd(int id, int pwd) {
Connection connection = null;
boolean flag = false;
//修改密码
try {
connection = BaseDao.getConnection();
if (userDao.updatePwd(connection,id,pwd)>0){
flag = true;
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return flag;
}7.记得实现复用，需要提取出方法
java
package com.jibu.servlet.user;
import com.jibu.pojo.User;
import com.jibu.service.user.UserService;
import com.jibu.service.user.UserServiceImpl;
import com.jibu.util.Constants;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
//实现Servlet复用
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if (method.equals("savepwd")&&method!=null){
this.updatePwd(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req,resp);
}
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
//从Session里面拿ID;
Object o = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
boolean flag = false;
if (o!=null && newpassword!=null){
UserService userService = new UserServiceImpl();
flag = userService.updatePwd(((User) o).getId(), newpassword);
if (flag){
req.setAttribute("message","修改密码成功，请退出，使用新密码登录");
//密码修改成功，移除当前Session
req.getSession().removeAttribute(Constants.USER_SESSION);
}else {
req.setAttribute("message","密码修改失败");
}
}else {
req.setAttribute("message","新密码有问题");
}
try {
req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
XML
<servlet>
<servlet-name>UserServlet</servlet-name>
<servlet-class>com.jibu.servlet.user.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserServlet</servlet-name>
<url-pattern>/jsp/user.do</url-pattern>
</servlet-mapping>8.测试
优化密码修改使用Ajax
1.阿里巴巴的fastjson
XML
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.61</version>
</dependency>2.后台代码修改
java
//修改密码
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
//从Session里面拿ID;
Object o = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
boolean flag = false;
if (o!=null && !StringUtils.isNullOrEmpty(newpassword)){
UserService userService = new UserServiceImpl();
flag = userService.updatePwd(((User) o).getId(), newpassword);
if (flag){
req.setAttribute("message","修改密码成功，请退出，使用新密码登录");
//密码修改成功，移除当前Session
req.getSession().removeAttribute(Constants.USER_SESSION);
}else {
req.setAttribute("message","密码修改失败");
}
}else {
req.setAttribute("message","新密码有问题");
}
try {
req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//验证旧密码,session中有用户的密码
public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
//从Session里面拿ID;
Object o = req.getSession().getAttribute(Constants.USER_SESSION);
String oldpassword = req.getParameter("oldpassword");
//万能的Map : 结果集
Map<String, String> resultMap = new HashMap<>();
if (o==null){//session失效了，session过期了
resultMap.put("result","sessionerror");
}else if (StringUtils.isNullOrEmpty(oldpassword)){//输入的密码为空
resultMap.put("result","error");
}else {
String userPassword = ((User) o).getUserPassword();//session中用户的密码
if (oldpassword.equals(userPassword)){
resultMap.put("result","true");
}else {
resultMap.put("result","false");
}
}
try {
resp.setContentType("application/json");
PrintWriter writer = resp.getWriter();
//JSONArray 阿里巴巴的JSON工具类，转换格式
/*
resultMap = ["result","sessionerror","result","error"]
Json格式 = {key:value}
*/
writer.write(JSONArray.toJSONString(resultMap));
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}3.测试
用户管理实现
思路：
1.导入分页的工具类
2.用户列表页面导入
userlist.jsp
1、获取用户数量
1.UserDao
java
//查询用户总数
public int getUserCount(Connection connection,String username,int userRole) throws SQLException;2.UserDaoImpl
java
//根据用户名或者角色查询用户总数【最难理解的sql】
@Override
public int getUserCount(Connection connection, String username, int userRole) throws SQLException {
PreparedStatement pstm = null;
ResultSet rs = null;
int count = 0;
if (connection!=null){
StringBuffer sql = new StringBuffer();
sql.append("select count(1) as count from smbms_user u ,smbms_role r where u.userRole = r.id");
ArrayList<Object> list = new ArrayList<>();//存放我们的参数
if (!StringUtils.isNullOrEmpty(username)){
sql.append(" and u.userName like ?");
list.add("%"+username+"%");//index：0
}
if (userRole>0){
sql.append(" and u.userRole = ?");
list.add(userRole);//index：1
}
//怎么把list转换为数组
Object[] params = list.toArray();
System.out.println("UserDaoImpl->getUserCount:"+sql.toString());//输出最后完整的SQL语句
rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
if (rs.next()){
count = rs.getInt("count");//从结果集中获取最终的数量
}
BaseDao.closeResource(null,pstm,rs);
}
return count;
}3.UserService
java
//查询记录数
public int getUserCount(String username,int userRole);3.UserServiceImpl
java
//查询记录数
@Override
public int getUserCount(String username, int userRole) {
Connection connection = null;
int count = 0;
try {
connection = BaseDao.getConnection();
count = userDao.getUserCount(connection, username, userRole);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return count;
}2、获取用户列表
1.UserDao
java
//通过条件查询-userList
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize)throws Exception;2.UserDaoImpl
java
@Override
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws Exception {
// TODO Auto-generated method stub
PreparedStatement pstm = null;
ResultSet rs = null;
List<User> userList = new ArrayList<User>();
if(connection != null){
StringBuffer sql = new StringBuffer();
sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r.id");
List<Object> list = new ArrayList<Object>();
if(!StringUtils.isNullOrEmpty(userName)){
sql.append(" and u.userName like ?");
list.add("%"+userName+"%");
}
if(userRole > 0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
//在数据库中分页使用 limit startIndex，pageSize; 总数
//0,5 1
//5,5
//10,5
sql.append(" order by creationDate DESC limit ?,?");
currentPageNo = (currentPageNo-1)*pageSize;
list.add(currentPageNo);
list.add(pageSize);
Object[] params = list.toArray();
System.out.println("sql ----> " + sql.toString());
rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
while(rs.next()){
User _user = new User();
_user.setId(rs.getInt("id"));
_user.setUserCode(rs.getString("userCode"));
_user.setUserName(rs.getString("userName"));
_user.setGender(rs.getInt("gender"));
_user.setBirthday(rs.getDate("birthday"));
_user.setPhone(rs.getString("phone"));
_user.setUserRole(rs.getInt("userRole"));
_user.setUserRoleName(rs.getString("userRoleName"));
userList.add(_user);
}
BaseDao.closeResource(null, pstm, rs);
}
return userList;
}3.UserService
java
//根据条件查询用户列表
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize);4.UserSeviceImpl
java
@Override
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {
// TODO Auto-generated method stub
Connection connection = null;
List<User> userList = null;
System.out.println("queryUserName ---- > " + queryUserName);
System.out.println("queryUserRole ---- > " + queryUserRole);
System.out.println("currentPageNo ---- > " + currentPageNo);
System.out.println("pageSize ---- > " + pageSize);
try {
connection = BaseDao.getConnection();
userList = userDao.getUserList(connection, queryUserName,queryUserRole,currentPageNo,pageSize);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return userList;
}3、获取角色操作
为了我们职责统一，可以把角色的操作单独放在一个包中，和POJO类对应
1.RoleDao
java
package com.jibu.dao.role;
import com.jibu.pojo.Role;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
public interface RoleDao {
//获取角色列表
public List<Role> getRoleList(Connection connection) throws SQLException;
}2.RoleDaoImpl
java
package com.jibu.dao.role;
import com.jibu.dao.BaseDao;
import com.jibu.pojo.Role;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class RoleDaoImpl implements RoleDao{
//获取角色列表
@Override
public List<Role> getRoleList(Connection connection) throws SQLException {
PreparedStatement pstm = null;
ResultSet resultSet = null;
ArrayList<Role> roleList = new ArrayList<>();
if (connection != null){
String sql = "select * from smbms_role";
Object[] params = {};
resultSet = BaseDao.execute(connection, pstm, resultSet, sql, params);
while (resultSet.next()){
Role _role = new Role();
_role.setId(resultSet.getInt("id"));
_role.setRoleCode(resultSet.getString("userCode"));
_role.setRoleName(resultSet.getString("userName"));
roleList.add(_role);
}
BaseDao.closeResource(null,pstm,resultSet);
}
return roleList;
}
}3.RoleService
java
package com.jibu.service.role;
import com.jibu.pojo.Role;
import java.util.List;
public interface RoleService {
//获取角色列表
public List<Role> getRoleList();
}4.RoleServiceImpl
java
package com.jibu.service.role;
import com.jibu.dao.BaseDao;
import com.jibu.dao.role.RoleDao;
import com.jibu.dao.role.RoleDaoImpl;
import com.jibu.pojo.Role;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
public class RoleServiceImpl implements RoleService{
//引入Dao
private RoleDao roleDao;
public RoleServiceImpl() {
roleDao = new RoleDaoImpl();
}
@Override
public List<Role> getRoleList() {
Connection connection = null;
List<Role> roleList = null;
try {
connection = BaseDao.getConnection();
roleList = roleDao.getRoleList(connection);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return roleList;
}
}4、用户显示的Servlet
1.获取用户前端的数据（查询）
2.判断请求是否需要执行，看参数的值判断
3.为了实现分页，需要计算出当前页面和总页面，页面大小
4.用户列表展示
5.返回前端
java
//重点、难点
public void query(HttpServletRequest req, HttpServletResponse resp){
//查询用户列表
//从前端获取数据
String queryUserName = req.getParameter("queryname");
String temp = req.getParameter("queryUserRole");
String pageIndex = req.getParameter("pageIndex");
int queryUserRole = 0;
//获取用户列表
UserServiceImpl userService = new UserServiceImpl();
List<User> userList = null;
//第一次走这个请求一定是第一页，并且页面大小是固定的
int pageSize = 5;//可以把这个写到配置文件里，方便后期修改；
int currentPageNo = 1;
if (queryUserName == null){
queryUserName = "";
}
if (temp!=null && !temp.equals("")){
queryUserRole = Integer.parseInt(temp); //给查询赋值
}
if (pageIndex!=null){
currentPageNo = Integer.parseInt(pageIndex);
}
//获取用户的总数(分页： 上一页，下一页的情况)
int totalCount = userService.getUserCount(queryUserName, queryUserRole);
//总页数支持
PageSupport pageSupport = new PageSupport();
pageSupport.setCurrentPageNo(currentPageNo);
pageSupport.setPageSize(pageSize);
pageSupport.setTotalCount(totalCount);
int totalPageCount = pageSupport.getTotalPageCount();//最大页数
//控制首页和尾页
//如果页面要小于1了，就显示第一页的东西
if (totalPageCount<1){
totalPageCount = 1;
} else if (currentPageNo>totalPageCount) {//当前页面大于了最后一页；
currentPageNo = totalPageCount;
}
//获取用户列表展示
userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
req.setAttribute("userList",userList);
RoleServiceImpl roleService = new RoleServiceImpl();
List<Role> roleList = roleService.getRoleList();
req.setAttribute("roleList",roleList);
req.setAttribute("totalCount",totalCount);
req.setAttribute("currentPageNo",currentPageNo);
req.setAttribute("totalPageCount",totalPageCount);
req.setAttribute("queryUserName",queryUserName);
req.setAttribute("queryUserRole",queryUserRole);
//返回前端
try {
req.getRequestDispatcher("userlist.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}小黄鸭调试法
